Flipkart — Sell back option: Payment not received

Address:	Bangalore
Website:	www.flipkart.com

Under Flipkart's sell back program, I sold my 2 phones mentioned below:

1. Google PIXEL 4A (for Rs.10500/-)
2. Apple iPhone SE (for Rs. 4000/-)

The delivery boy picked my phone on 12/08/2022 and handed me a Thank your card envelope packet, which only had a Thank you card and nothing else (Doesn't have any pass code to redeem the amount to Flipkart wallet).
Delivery person and Thank you card both says that - -
I will receive my payment within 24 hours. However, I haven't received my money yet... either to my bank account and to the Flipkart wallet.

I have been calling Flipkart customer care multiple times to resolve the issue. There customer support is not resolving the it and instead will keep your call on hold for a long time and then they will either transfer to another person or they are disconnecting the call..

This is really frustrating and really unhappy with the service of Flipkart.
My financial condition has been impacted since I was expecting the above mentioned amount for some critical commitments..

Order ID;s for your reference:
1. OD[protected]
2. OD[protected]

Please resolve the issue at the earliest and credit the respective amount.